Photopolymerization of methyl methacrylate using dye-sensitized semiconductor based photocatalyst

Photocatalytic Properties of Tin Oxide and Antimony-Doped Tin Oxide Nanoparticles

“…Hence, the C=C propagation step at the initial part of the polymerization reaction can be partly described as a reaction between a polymer fragment with a methacrylate radical end group and a methacrylate MPS C=C bond. Moreover, the ratios of (4). For Sb : SnO 2 particles without Sb-doping no S-shape relation between the decrease in the C=C bond absorption and irradiation time is found and the rate at the initial stage of the reaction is the largest rate measured.…”

“…Hence, at this moment in time the propagation step of the C=C bond polymerization at time t = t max can be described as the reaction between a polymer fragment with an acrylate end group radical and an acrylate monomer. This means that the differences found in the relative quantum yield K * max 1637 for the different incident light wavelengths in Table 3b are caused by a difference in the quantum yield Φ Sb-7% for the formation of the initiating radical (4). Figure 4b).…”

“…Recently, we showed that the polymerizations of the (meth)acrylate C=C bonds photocatalyzed by MPSSb : SnO 2 (Sb ≥ 0%) nanoparticles using radiation of 315 nm can be explained by (1a)- (4). To test whether these equations also explain our results for illuminations with wavelengths of light above 340 nm, experiments with 365 nm were done with two different light intensities, one nine times lower than the other using for both the same starting MPS-Sb : SnO 2 /PEGDA dispersion.…”

“…These materials are used, for instance, in the treatment of pollutants, for photosterilisation, for photo-induced superhydrophilicity in solar energy to electrical power conversion and photochemical water splitting systems. Also semiconductive nanoparticles/nanostructures can act as a photocatalyst in (meth)acrylate polymerization [2][3][4]. Most of these applications require a large conversion efficiency under visible (solar) light illumination, but for many of these materials this efficiency is absent, because they absorb only a small fraction of the UV part of the solar spectrum.…”

Ultrasonic synthesis of high fluorescent C-dots and modified with CuWO4 nanocomposite for effective photocatalytic activity

“…Unfortunately, the insufficient quantum efficiency, narrow excitation wavelength, high recombination rate of the photoproduced electronehole pairs, contributes to poor adsorption capacity and deactivation of the semiconductor photocatalyst [11,12]. Therefore, several methods have been reported to reduce the recombination of charge carriers by coupling the photocatalyst with electron scavenging agents, such as noble metals [13], including metal particle loading [14], co-catalysts [15], dyesensitization [16], metallic and non-metallic doping [17], semiconductors [18] and carbon nanomaterials [19e21].…”